Free to use, not requiring paying a toll to use.(adjective)
Without an additional toll, especially for a long distance charge.(adjective)
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Use "toll-free" in a sentence
"I called the toll-free Rio Salado information number to get additional information."
"The services are heavily marketed to cardholders, particularly when you call a toll-free number to activate a card or ask a question, or when a customer-service rep calls to answer an inquiry."
"I called the toll-free number and plugged in my card number."